(1) Abide by relevant national and local guidelines, policies, decrees and regulations. Such as material management policy, material distribution policy, economic contract law, various financial systems and rules and regulations of industrial and commercial administrative departments.

(2) Purchasing according to demand and plan. Procurement must be based on the actual material varieties, specifications, quantity and time requirements in the material procurement plan. Carry out the principle of "purchase on demand" and make a comprehensive balance by combining the production, market, transportation and reserve of materials.

(3) Adhere to the principle of material quality first. Ensure the quality of purchased materials, and materials that do not meet the quality requirements shall not enter the production workshop or construction site. It is necessary to go deep into the production plants and markets at any time, and urge the production plants to improve product quality and select the best procurement. Purchasing personnel must be familiar with the quality standards of purchased materials and do a good job in acceptance and appraisal. Materials that do not meet the quality requirements will never be purchased.

(4) Reduce procurement costs. In the process of material procurement, it is necessary to carry out "three-to-one accounting" (quality comparison, price comparison, distance comparison and cost accounting). The materials supplied in the market come from different places, because of different production methods, different product costs and different quality. Therefore, when purchasing materials, we must pay attention to the homogeneity of the same materials, the homogeneity and the same price, the same price and the same distance, and make comprehensive calculations to reduce the cost of material procurement.

(5) Choose a material production unit with smooth and convenient material transportation. The materials needed by production and construction enterprises, especially construction enterprises, are large in quantity and geographically dispersed, and must be transported to the site on time by a certain number of means of transportation. If the transportation power is insufficient, even if there are resources, it can't be shipped out. In order to transport the required materials to the construction site in time and safely, materials must be selected from areas and units with sufficient transportation power and good geographical and transportation conditions to ensure the completion of the material procurement and supply tasks.